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Have you purchased your steam humidifier yet?
I know EWC's Autoflow brand steam humidifiers will turn the system fan on themselves when himidification is needed, and isolate the call to the G terminal of the equipment from G on the thermostat.

They also give instructions for how to set up a fan failure safety lockout.

Originally posted by producteng I'm not interested in discussing the pros and cons of humidification, which is why I specifically left that out of my first post. What I AM interested in is what happens when you put a second set of contacts in parallel across R & G, which is exactly what I DID ask in my first post.

Thanks anyway.

I'm an idiot and need your help, But I also want to be a smart a$$ with reply's like above. Take a jumper from R-C if you see a spark it will work fine..